Yeh sub kehnay ki baaten hain. The comparison in figures is completely inaccurate. A comparison of costs/km of such projects will never be adequate without taking into consideration the overall design, length, outlay, utilities, purpose and geography of the city. By way of example jis 'khoobsurat Paris metro bus' ki baat ho ri hai, its infrastructure pales in comparison to the ISB-RWP metro. The Paris bus service does not have dedicated flyovers and underpasses and the service in large uses the existing road infrastructure on its daily routes hence its construction costs are obviously going to be much less.
These shoddy comparisons are nothing more than political propaganda. I want to see a proper comparison. Going to dismiss all such 'Mubashir Lucman' brain farts until then.
Just to give you a rough idea of how expensive dedicated metro infrastructure projects can be,as is often in the case of rail, which the existing ISB-RWP metro bus route can accommodate, here's a list:
Singapore Thomson MRT Line: not yet under construction, expected to open 2019-21,S$18 billion for 30 km. This is $600 million/km, all underground. Included only as a lower bound of costs; costs can rise beyond budget but rarely come significantly under it.
Hong Kong Sha Tin to Central Link: a 1-km segment underground (not underwater) is £270 million, under construction with opening expected in 2018. After converting to PPP using Hong Kong’s conversion rate this is $586 million/km.
Singapore Downtown MRT Line: under construction since around 2008, to be completed in 2017; S$20.7 billion for 42 km: $493 million/km. This line is fully underground. This represents a 70% cost overrun already, announced after I previously reported the original budget of S$12 billion.
Budapest Metro Line 4: under construction since 2006, completion expected in 2014, 400 billion forint for 7.4 km. This is $358 million per km. The line is fully underground.
Fukuoka, Nanakuma Line extension to Hakata: construction expected to begin 2014 with line opening expected in 2020, ¥45 billion for 1.4 km: $321 million/km. I do not know for certain that the extension is fully underground, but this is likely, as the preexisting line is underground and the extension follows busy CBD streets.
Cairo Metro Line 3, Phase 1: opened 2012 with construction since 2006, LE4.2 billion for4.3 km. This is $310 million/km. The phase is fully underground.
Kawasaki Subway: under construction, opening expected in 2018, ¥433.6 billion for 16.7 km: $260 million/km. The line is fully underground. Update: people in comments explain that the line was actually canceled; the link in this paragraph is just a plan.
Stockholm City Line: to open in 2017, 16.8 billion kronor (2007 prices) for 6 km of tunnel and 1.4 km of bridge: $259 million/km.
Sao Paulo Metro Line 6: construction due to begin in 2014; 7.8 billion reais for 15.9 km: $250 million/km. The line is 84% underground.
Sao Paulo Metro Line 4: construction began in 2004, first phase opened in 2010, completion expected in 2014; 5.6 billion reais for 12.8 km: $223 million/km. The line is fully underground.
Dnipropetrovsk Metro extension: under construction since about 2008, opening expected in 2015, €367 million for 4 km. After PPP conversion this is $214 million/km. It appears to be fully underground.
Malmö City Tunnel: built 2005-10, 9 billion kronor for 4.65 km: $212 million/km. This is a fully underground project.
Bangalore Metro Phase 2: to be opened by 2017, 264 billion rupees for 72.1 km. This is $164 million/km. I do not know what proportion of the project is underground; it does not seem to be large, as the extension of the phase 1 lines are all outbound, and only line 4 seems to have significant tunneling, about 14 km by pure Wikipedia eyeballing.
San Juan Tren Urbano: built 1996-2004, $2.28 billion (2001 figures, see PDF-p. 145) for17.2 km: $163 million/km. The line is only 7.5% underground by direct inspection on Google Earth.
Lucern Zentralbahn: built 2008-13, CHF250 million for 1.32 km of tunnel: $151 million/km.
Hangzhou: I can’t find any ex post numbers, but in both 2005 and this year (Chinese) officials pegged the cost of future construction as ¥550 million/km: $145 million/km.
Sofia Metro Line 2: built 2008-12, €952 million for 17 km. After PPP conversion, this is $148 million/km. The line appears to be almost fully underground: the numbers here do not fully add up but point to 1.3-2.9 km above ground (7.6-13% of total line length) in one segment while Wikipedia’s line map shows only that segment with above-ground segments.
Thessaloniki: I can’t find any ex post numbers, but in 2005 the budget for the first phase, under construction to be opened in 2016, was €798 million for 9.6 km: $104 million/km. The second phase received bids last year and is expected to open in 2017, with an estimated cost of €518 million for 4.78 km: $135 million/km. Both phases are fully underground.
Vancouver Evergreen Line: under construction since 2012, completion expected 2016;C$1.4 billion for 11 km: $103 million/km. Only 2 km of the system, 18%, is underground, but Vancouver seems to have an unusually low underground construction cost premium.
Dubai Metro (lines 1 and 2): built 2005-11, Dh28 billion ($6.9 billion in PPP2010US$) for75 km: $92 million/km. Only 13 km of the system, 17%, is underground.
Mexico City Metro Line 12: built 2007-2012, $1.8 billion for 26.4 km. After PPP conversion, this is $90 million/km. From a Google Earth overlay map, this line is 49% underground.
Seoul Sin-Bundang Line: built 2005-11, 1,169 billion won for about 18 km (sources disagree on whether it’s 17.3 or 18.5): $87 million/km. The line is 100% underground according to YouTube videos.
Bangalore Metro, Phase 1: built 2006-11, 8,158 crore rupees for 42.3 km: $93 million/km. Only 8.82 km, or 21% of the project, is underground. See above for Indian construction costs in a heavier-tunneling setting.
Helsinki Westmetro: under construction since 2009 with completion expected in 2015, €714 million for 13.5 kilometers: $66 million/km. The line is fully underground.
Seoul Subway Line 9: opened 2009, 900 billion won for 27 km: $43 million/km. The line is almost fully underground by direct inspection on Google Maps.
Barcelona Sants-La Sagrera tunnel: built 2008-11, €179.3 million for 5.8 km: $39 million/km. This project is intercity but fully underground.
Comparative Subway Construction Costs, Revised | Pedestrian Observations